Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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Experimental Investigation of Steam Condensation Heat Transfer in the Presence of Noncondensable Gas on a Vertical Tube

수직 튜브 외벽에서의 증기-비응축성 기체 응축 열전달 실험 연구

  • Lee, Yeon-Gun (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Jang, Yeong-Jun (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Choi, Dong-Jae (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Kim, Sin (School of Energy Systems Engineering, Chung-Ang University)
  • 이연건 (제주대학교 에너지공학과) ;
  • 장영준 (제주대학교 에너지공학과) ;
  • 최동재 (제주대학교 에너지공학과) ;
  • 김신 (중앙대학교 에너지시스템공학부)
  • Received : 2014.12.12
  • Accepted : 2015.02.27
  • Published : 2015.03.31
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Abstract

To evaluate the heat removal capability of a condenser tube in the PCCS of an advanced nuclear power plant, a steam condensation experiment in the presence of noncondensable gas on a vertical tube is performed. The average heat transfer coefficient is measured on a vertical tube of 40 mm in O.D. and 1.0 m in length. The experiments covers the pressures of 2-4 bar, and the mass fraction of air ranges from 0.1 up to 0.7. From the experimental results, the effects of the total pressure and the concentration of air on the condensation heat transfer coefficient are investigated. The measured data are compared with the predictions by Uchida's and Tagami's correlations, and it is revealed that these models underestimate the condensation heat transfer coefficient of the steam-air mixture.

신형 원전의 피동격납건물냉각계통(PCCS: Passive Containment Cooling System)을 구성하는 단일 전열관의 열제거 성능을 평가하기 위해, 비응축성 기체 존재 시 수직 튜브 외벽에서 발생하는 증기의 응축 열전달에 대한 실험을 수행하였다. 외경 40 mm, 길이 1.0 m의 전열관 외벽에서 증기-공기 혼합물의 평균 열전달계수를 측정하였으며, 압력 2-4 bar, 공기의 질량분율 0.1-0.7의 범위에서 실험데이터를 수집하였다. 이를 통해 압력과 비응축성기체의 농도가 응축 열전달계수에 미치는 영향을 평가하였다. 실험결과를 기존의 열전달모델인 Uchida와 Dehbi의 상관식과 비교하였으며, 이들 상관식은 실험결과에 비해 상대적으로 열전달계수를 낮게 예측함을 확인하였다.

Keywords

References

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